OLD | NEW |
1 // Copyright 2006-2008 the V8 project authors. All rights reserved. | 1 // Copyright 2006-2008 the V8 project authors. All rights reserved. |
2 // Redistribution and use in source and binary forms, with or without | 2 // Redistribution and use in source and binary forms, with or without |
3 // modification, are permitted provided that the following conditions are | 3 // modification, are permitted provided that the following conditions are |
4 // met: | 4 // met: |
5 // | 5 // |
6 // * Redistributions of source code must retain the above copyright | 6 // * Redistributions of source code must retain the above copyright |
7 // notice, this list of conditions and the following disclaimer. | 7 // notice, this list of conditions and the following disclaimer. |
8 // * Redistributions in binary form must reproduce the above | 8 // * Redistributions in binary form must reproduce the above |
9 // copyright notice, this list of conditions and the following | 9 // copyright notice, this list of conditions and the following |
10 // disclaimer in the documentation and/or other materials provided | 10 // disclaimer in the documentation and/or other materials provided |
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22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | 22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | 23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | 24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | 25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | 26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
27 | 27 |
28 #ifndef V8_CODE_STUBS_H_ | 28 #ifndef V8_CODE_STUBS_H_ |
29 #define V8_CODE_STUBS_H_ | 29 #define V8_CODE_STUBS_H_ |
30 | 30 |
31 #include "globals.h" | 31 #include "globals.h" |
| 32 #include "macro-assembler.h" |
32 | 33 |
33 namespace v8 { | 34 namespace v8 { |
34 namespace internal { | 35 namespace internal { |
35 | 36 |
36 // List of code stubs used on all platforms. The order in this list is important | 37 // List of code stubs used on all platforms. The order in this list is important |
37 // as only the stubs up to and including RecordWrite allows nested stub calls. | 38 // as only the stubs up to and including RecordWrite allows nested stub calls. |
38 #define CODE_STUB_LIST_ALL_PLATFORMS(V) \ | 39 #define CODE_STUB_LIST_ALL_PLATFORMS(V) \ |
39 V(CallFunction) \ | 40 V(CallFunction) \ |
40 V(GenericBinaryOp) \ | 41 V(GenericBinaryOp) \ |
41 V(StringAdd) \ | 42 V(StringAdd) \ |
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73 V(RegExpCEntry) | 74 V(RegExpCEntry) |
74 #else | 75 #else |
75 #define CODE_STUB_LIST_ARM(V) | 76 #define CODE_STUB_LIST_ARM(V) |
76 #endif | 77 #endif |
77 | 78 |
78 // Combined list of code stubs. | 79 // Combined list of code stubs. |
79 #define CODE_STUB_LIST(V) \ | 80 #define CODE_STUB_LIST(V) \ |
80 CODE_STUB_LIST_ALL_PLATFORMS(V) \ | 81 CODE_STUB_LIST_ALL_PLATFORMS(V) \ |
81 CODE_STUB_LIST_ARM(V) | 82 CODE_STUB_LIST_ARM(V) |
82 | 83 |
| 84 // Types of uncatchable exceptions. |
| 85 enum UncatchableExceptionType { OUT_OF_MEMORY, TERMINATION }; |
| 86 |
| 87 // Mode to overwrite BinaryExpression values. |
| 88 enum OverwriteMode { NO_OVERWRITE, OVERWRITE_LEFT, OVERWRITE_RIGHT }; |
| 89 enum UnaryOverwriteMode { UNARY_OVERWRITE, UNARY_NO_OVERWRITE }; |
| 90 |
| 91 |
83 // Stub is base classes of all stubs. | 92 // Stub is base classes of all stubs. |
84 class CodeStub BASE_EMBEDDED { | 93 class CodeStub BASE_EMBEDDED { |
85 public: | 94 public: |
86 enum Major { | 95 enum Major { |
87 #define DEF_ENUM(name) name, | 96 #define DEF_ENUM(name) name, |
88 CODE_STUB_LIST(DEF_ENUM) | 97 CODE_STUB_LIST(DEF_ENUM) |
89 #undef DEF_ENUM | 98 #undef DEF_ENUM |
90 NoCache, // marker for stubs that do custom caching | 99 NoCache, // marker for stubs that do custom caching |
91 NUMBER_OF_IDS | 100 NUMBER_OF_IDS |
92 }; | 101 }; |
93 | 102 |
94 // Retrieve the code for the stub. Generate the code if needed. | 103 // Retrieve the code for the stub. Generate the code if needed. |
95 Handle<Code> GetCode(); | 104 Handle<Code> GetCode(); |
96 | 105 |
97 // Retrieve the code for the stub if already generated. Do not | 106 // Retrieve the code for the stub if already generated. Do not |
98 // generate the code if not already generated and instead return a | 107 // generate the code if not already generated and instead return a |
99 // retry after GC Failure object. | 108 // retry after GC Failure object. |
100 Object* TryGetCode(); | 109 Object* TryGetCode(); |
101 | 110 |
102 static Major MajorKeyFromKey(uint32_t key) { | 111 static Major MajorKeyFromKey(uint32_t key) { |
103 return static_cast<Major>(MajorKeyBits::decode(key)); | 112 return static_cast<Major>(MajorKeyBits::decode(key)); |
104 }; | 113 }; |
105 static int MinorKeyFromKey(uint32_t key) { | 114 static int MinorKeyFromKey(uint32_t key) { |
106 return MinorKeyBits::decode(key); | 115 return MinorKeyBits::decode(key); |
107 }; | 116 }; |
| 117 |
| 118 // Gets the major key from a code object that is a code stub or binary op IC. |
| 119 static Major GetMajorKey(Code* code_stub) { |
| 120 return static_cast<Major>(code_stub->major_key()); |
| 121 } |
| 122 |
108 static const char* MajorName(Major major_key, bool allow_unknown_keys); | 123 static const char* MajorName(Major major_key, bool allow_unknown_keys); |
109 | 124 |
110 virtual ~CodeStub() {} | 125 virtual ~CodeStub() {} |
111 | 126 |
112 // Override these methods to provide a custom caching mechanism for | 127 // Override these methods to provide a custom caching mechanism for |
113 // an individual type of code stub. | 128 // an individual type of code stub. |
114 virtual bool GetCustomCache(Code** code_out) { return false; } | 129 virtual bool GetCustomCache(Code** code_out) { return false; } |
115 virtual void SetCustomCache(Code* value) { } | 130 virtual void SetCustomCache(Code* value) { } |
116 virtual bool has_custom_cache() { return false; } | 131 virtual bool has_custom_cache() { return false; } |
117 | 132 |
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165 } | 180 } |
166 | 181 |
167 bool AllowsStubCalls() { return MajorKey() <= RecordWrite; } | 182 bool AllowsStubCalls() { return MajorKey() <= RecordWrite; } |
168 | 183 |
169 class MajorKeyBits: public BitField<uint32_t, 0, kMajorBits> {}; | 184 class MajorKeyBits: public BitField<uint32_t, 0, kMajorBits> {}; |
170 class MinorKeyBits: public BitField<uint32_t, kMajorBits, kMinorBits> {}; | 185 class MinorKeyBits: public BitField<uint32_t, kMajorBits, kMinorBits> {}; |
171 | 186 |
172 friend class BreakPointIterator; | 187 friend class BreakPointIterator; |
173 }; | 188 }; |
174 | 189 |
| 190 |
| 191 // Helper interface to prepare to/restore after making runtime calls. |
| 192 class RuntimeCallHelper { |
| 193 public: |
| 194 virtual ~RuntimeCallHelper() {} |
| 195 |
| 196 virtual void BeforeCall(MacroAssembler* masm) const = 0; |
| 197 |
| 198 virtual void AfterCall(MacroAssembler* masm) const = 0; |
| 199 |
| 200 protected: |
| 201 RuntimeCallHelper() {} |
| 202 |
| 203 private: |
| 204 DISALLOW_COPY_AND_ASSIGN(RuntimeCallHelper); |
| 205 }; |
| 206 |
175 } } // namespace v8::internal | 207 } } // namespace v8::internal |
176 | 208 |
| 209 #if V8_TARGET_ARCH_IA32 |
| 210 #include "ia32/code-stubs-ia32.h" |
| 211 #elif V8_TARGET_ARCH_X64 |
| 212 #include "x64/code-stubs-x64.h" |
| 213 #elif V8_TARGET_ARCH_ARM |
| 214 #include "arm/code-stubs-arm.h" |
| 215 #elif V8_TARGET_ARCH_MIPS |
| 216 #include "mips/code-stubs-mips.h" |
| 217 #else |
| 218 #error Unsupported target architecture. |
| 219 #endif |
| 220 |
| 221 namespace v8 { |
| 222 namespace internal { |
| 223 |
| 224 |
| 225 // RuntimeCallHelper implementation used in IC stubs: enters/leaves a |
| 226 // newly created internal frame before/after the runtime call. |
| 227 class ICRuntimeCallHelper : public RuntimeCallHelper { |
| 228 public: |
| 229 ICRuntimeCallHelper() {} |
| 230 |
| 231 virtual void BeforeCall(MacroAssembler* masm) const; |
| 232 |
| 233 virtual void AfterCall(MacroAssembler* masm) const; |
| 234 }; |
| 235 |
| 236 |
| 237 // Trivial RuntimeCallHelper implementation. |
| 238 class NopRuntimeCallHelper : public RuntimeCallHelper { |
| 239 public: |
| 240 NopRuntimeCallHelper() {} |
| 241 |
| 242 virtual void BeforeCall(MacroAssembler* masm) const {} |
| 243 |
| 244 virtual void AfterCall(MacroAssembler* masm) const {} |
| 245 }; |
| 246 |
| 247 |
| 248 class StackCheckStub : public CodeStub { |
| 249 public: |
| 250 StackCheckStub() { } |
| 251 |
| 252 void Generate(MacroAssembler* masm); |
| 253 |
| 254 private: |
| 255 |
| 256 const char* GetName() { return "StackCheckStub"; } |
| 257 |
| 258 Major MajorKey() { return StackCheck; } |
| 259 int MinorKey() { return 0; } |
| 260 }; |
| 261 |
| 262 |
| 263 class FastNewClosureStub : public CodeStub { |
| 264 public: |
| 265 void Generate(MacroAssembler* masm); |
| 266 |
| 267 private: |
| 268 const char* GetName() { return "FastNewClosureStub"; } |
| 269 Major MajorKey() { return FastNewClosure; } |
| 270 int MinorKey() { return 0; } |
| 271 }; |
| 272 |
| 273 |
| 274 class FastNewContextStub : public CodeStub { |
| 275 public: |
| 276 static const int kMaximumSlots = 64; |
| 277 |
| 278 explicit FastNewContextStub(int slots) : slots_(slots) { |
| 279 ASSERT(slots_ > 0 && slots <= kMaximumSlots); |
| 280 } |
| 281 |
| 282 void Generate(MacroAssembler* masm); |
| 283 |
| 284 private: |
| 285 int slots_; |
| 286 |
| 287 const char* GetName() { return "FastNewContextStub"; } |
| 288 Major MajorKey() { return FastNewContext; } |
| 289 int MinorKey() { return slots_; } |
| 290 }; |
| 291 |
| 292 |
| 293 class FastCloneShallowArrayStub : public CodeStub { |
| 294 public: |
| 295 // Maximum length of copied elements array. |
| 296 static const int kMaximumClonedLength = 8; |
| 297 |
| 298 enum Mode { |
| 299 CLONE_ELEMENTS, |
| 300 COPY_ON_WRITE_ELEMENTS |
| 301 }; |
| 302 |
| 303 FastCloneShallowArrayStub(Mode mode, int length) |
| 304 : mode_(mode), |
| 305 length_((mode == COPY_ON_WRITE_ELEMENTS) ? 0 : length) { |
| 306 ASSERT(length_ >= 0); |
| 307 ASSERT(length_ <= kMaximumClonedLength); |
| 308 } |
| 309 |
| 310 void Generate(MacroAssembler* masm); |
| 311 |
| 312 private: |
| 313 Mode mode_; |
| 314 int length_; |
| 315 |
| 316 const char* GetName() { return "FastCloneShallowArrayStub"; } |
| 317 Major MajorKey() { return FastCloneShallowArray; } |
| 318 int MinorKey() { |
| 319 ASSERT(mode_ == 0 || mode_ == 1); |
| 320 return (length_ << 1) | mode_; |
| 321 } |
| 322 }; |
| 323 |
| 324 |
| 325 class InstanceofStub: public CodeStub { |
| 326 public: |
| 327 InstanceofStub() { } |
| 328 |
| 329 void Generate(MacroAssembler* masm); |
| 330 |
| 331 private: |
| 332 Major MajorKey() { return Instanceof; } |
| 333 int MinorKey() { return 0; } |
| 334 }; |
| 335 |
| 336 |
| 337 enum NegativeZeroHandling { |
| 338 kStrictNegativeZero, |
| 339 kIgnoreNegativeZero |
| 340 }; |
| 341 |
| 342 |
| 343 class GenericUnaryOpStub : public CodeStub { |
| 344 public: |
| 345 GenericUnaryOpStub(Token::Value op, |
| 346 UnaryOverwriteMode overwrite, |
| 347 NegativeZeroHandling negative_zero = kStrictNegativeZero) |
| 348 : op_(op), overwrite_(overwrite), negative_zero_(negative_zero) { } |
| 349 |
| 350 private: |
| 351 Token::Value op_; |
| 352 UnaryOverwriteMode overwrite_; |
| 353 NegativeZeroHandling negative_zero_; |
| 354 |
| 355 class OverwriteField: public BitField<UnaryOverwriteMode, 0, 1> {}; |
| 356 class NegativeZeroField: public BitField<NegativeZeroHandling, 1, 1> {}; |
| 357 class OpField: public BitField<Token::Value, 2, kMinorBits - 2> {}; |
| 358 |
| 359 Major MajorKey() { return GenericUnaryOp; } |
| 360 int MinorKey() { |
| 361 return OpField::encode(op_) | |
| 362 OverwriteField::encode(overwrite_) | |
| 363 NegativeZeroField::encode(negative_zero_); |
| 364 } |
| 365 |
| 366 void Generate(MacroAssembler* masm); |
| 367 |
| 368 const char* GetName(); |
| 369 }; |
| 370 |
| 371 |
| 372 enum NaNInformation { |
| 373 kBothCouldBeNaN, |
| 374 kCantBothBeNaN |
| 375 }; |
| 376 |
| 377 |
| 378 class CompareStub: public CodeStub { |
| 379 public: |
| 380 CompareStub(Condition cc, |
| 381 bool strict, |
| 382 NaNInformation nan_info = kBothCouldBeNaN, |
| 383 bool include_number_compare = true, |
| 384 Register lhs = no_reg, |
| 385 Register rhs = no_reg) : |
| 386 cc_(cc), |
| 387 strict_(strict), |
| 388 never_nan_nan_(nan_info == kCantBothBeNaN), |
| 389 include_number_compare_(include_number_compare), |
| 390 lhs_(lhs), |
| 391 rhs_(rhs), |
| 392 name_(NULL) { } |
| 393 |
| 394 void Generate(MacroAssembler* masm); |
| 395 |
| 396 private: |
| 397 Condition cc_; |
| 398 bool strict_; |
| 399 // Only used for 'equal' comparisons. Tells the stub that we already know |
| 400 // that at least one side of the comparison is not NaN. This allows the |
| 401 // stub to use object identity in the positive case. We ignore it when |
| 402 // generating the minor key for other comparisons to avoid creating more |
| 403 // stubs. |
| 404 bool never_nan_nan_; |
| 405 // Do generate the number comparison code in the stub. Stubs without number |
| 406 // comparison code is used when the number comparison has been inlined, and |
| 407 // the stub will be called if one of the operands is not a number. |
| 408 bool include_number_compare_; |
| 409 // Register holding the left hand side of the comparison if the stub gives |
| 410 // a choice, no_reg otherwise. |
| 411 Register lhs_; |
| 412 // Register holding the right hand side of the comparison if the stub gives |
| 413 // a choice, no_reg otherwise. |
| 414 Register rhs_; |
| 415 |
| 416 // Encoding of the minor key CCCCCCCCCCCCRCNS. |
| 417 class StrictField: public BitField<bool, 0, 1> {}; |
| 418 class NeverNanNanField: public BitField<bool, 1, 1> {}; |
| 419 class IncludeNumberCompareField: public BitField<bool, 2, 1> {}; |
| 420 class RegisterField: public BitField<bool, 3, 1> {}; |
| 421 class ConditionField: public BitField<int, 4, 12> {}; |
| 422 |
| 423 Major MajorKey() { return Compare; } |
| 424 |
| 425 int MinorKey(); |
| 426 |
| 427 // Branch to the label if the given object isn't a symbol. |
| 428 void BranchIfNonSymbol(MacroAssembler* masm, |
| 429 Label* label, |
| 430 Register object, |
| 431 Register scratch); |
| 432 |
| 433 // Unfortunately you have to run without snapshots to see most of these |
| 434 // names in the profile since most compare stubs end up in the snapshot. |
| 435 char* name_; |
| 436 const char* GetName(); |
| 437 #ifdef DEBUG |
| 438 void Print() { |
| 439 PrintF("CompareStub (cc %d), (strict %s), " |
| 440 "(never_nan_nan %s), (number_compare %s) ", |
| 441 static_cast<int>(cc_), |
| 442 strict_ ? "true" : "false", |
| 443 never_nan_nan_ ? "true" : "false", |
| 444 include_number_compare_ ? "included" : "not included"); |
| 445 |
| 446 if (!lhs_.is(no_reg) && !rhs_.is(no_reg)) { |
| 447 PrintF("(lhs r%d), (rhs r%d)\n", lhs_.code(), rhs_.code()); |
| 448 } else { |
| 449 PrintF("\n"); |
| 450 } |
| 451 } |
| 452 #endif |
| 453 }; |
| 454 |
| 455 |
| 456 class CEntryStub : public CodeStub { |
| 457 public: |
| 458 explicit CEntryStub(int result_size) : result_size_(result_size) { } |
| 459 |
| 460 void Generate(MacroAssembler* masm); |
| 461 |
| 462 private: |
| 463 void GenerateCore(MacroAssembler* masm, |
| 464 Label* throw_normal_exception, |
| 465 Label* throw_termination_exception, |
| 466 Label* throw_out_of_memory_exception, |
| 467 bool do_gc, |
| 468 bool always_allocate_scope, |
| 469 int alignment_skew = 0); |
| 470 void GenerateThrowTOS(MacroAssembler* masm); |
| 471 void GenerateThrowUncatchable(MacroAssembler* masm, |
| 472 UncatchableExceptionType type); |
| 473 |
| 474 // Number of pointers/values returned. |
| 475 const int result_size_; |
| 476 |
| 477 Major MajorKey() { return CEntry; } |
| 478 // Minor key must differ if different result_size_ values means different |
| 479 // code is generated. |
| 480 int MinorKey(); |
| 481 |
| 482 const char* GetName() { return "CEntryStub"; } |
| 483 }; |
| 484 |
| 485 |
| 486 class ApiGetterEntryStub : public CodeStub { |
| 487 public: |
| 488 ApiGetterEntryStub(Handle<AccessorInfo> info, |
| 489 ApiFunction* fun) |
| 490 : info_(info), |
| 491 fun_(fun) { } |
| 492 void Generate(MacroAssembler* masm); |
| 493 virtual bool has_custom_cache() { return true; } |
| 494 virtual bool GetCustomCache(Code** code_out); |
| 495 virtual void SetCustomCache(Code* value); |
| 496 |
| 497 static const int kStackSpace = 5; |
| 498 static const int kArgc = 4; |
| 499 private: |
| 500 Handle<AccessorInfo> info() { return info_; } |
| 501 ApiFunction* fun() { return fun_; } |
| 502 Major MajorKey() { return NoCache; } |
| 503 int MinorKey() { return 0; } |
| 504 const char* GetName() { return "ApiEntryStub"; } |
| 505 // The accessor info associated with the function. |
| 506 Handle<AccessorInfo> info_; |
| 507 // The function to be called. |
| 508 ApiFunction* fun_; |
| 509 }; |
| 510 |
| 511 |
| 512 class JSEntryStub : public CodeStub { |
| 513 public: |
| 514 JSEntryStub() { } |
| 515 |
| 516 void Generate(MacroAssembler* masm) { GenerateBody(masm, false); } |
| 517 |
| 518 protected: |
| 519 void GenerateBody(MacroAssembler* masm, bool is_construct); |
| 520 |
| 521 private: |
| 522 Major MajorKey() { return JSEntry; } |
| 523 int MinorKey() { return 0; } |
| 524 |
| 525 const char* GetName() { return "JSEntryStub"; } |
| 526 }; |
| 527 |
| 528 |
| 529 class JSConstructEntryStub : public JSEntryStub { |
| 530 public: |
| 531 JSConstructEntryStub() { } |
| 532 |
| 533 void Generate(MacroAssembler* masm) { GenerateBody(masm, true); } |
| 534 |
| 535 private: |
| 536 int MinorKey() { return 1; } |
| 537 |
| 538 const char* GetName() { return "JSConstructEntryStub"; } |
| 539 }; |
| 540 |
| 541 |
| 542 class ArgumentsAccessStub: public CodeStub { |
| 543 public: |
| 544 enum Type { |
| 545 READ_ELEMENT, |
| 546 NEW_OBJECT |
| 547 }; |
| 548 |
| 549 explicit ArgumentsAccessStub(Type type) : type_(type) { } |
| 550 |
| 551 private: |
| 552 Type type_; |
| 553 |
| 554 Major MajorKey() { return ArgumentsAccess; } |
| 555 int MinorKey() { return type_; } |
| 556 |
| 557 void Generate(MacroAssembler* masm); |
| 558 void GenerateReadElement(MacroAssembler* masm); |
| 559 void GenerateNewObject(MacroAssembler* masm); |
| 560 |
| 561 const char* GetName() { return "ArgumentsAccessStub"; } |
| 562 |
| 563 #ifdef DEBUG |
| 564 void Print() { |
| 565 PrintF("ArgumentsAccessStub (type %d)\n", type_); |
| 566 } |
| 567 #endif |
| 568 }; |
| 569 |
| 570 |
| 571 class RegExpExecStub: public CodeStub { |
| 572 public: |
| 573 RegExpExecStub() { } |
| 574 |
| 575 private: |
| 576 Major MajorKey() { return RegExpExec; } |
| 577 int MinorKey() { return 0; } |
| 578 |
| 579 void Generate(MacroAssembler* masm); |
| 580 |
| 581 const char* GetName() { return "RegExpExecStub"; } |
| 582 |
| 583 #ifdef DEBUG |
| 584 void Print() { |
| 585 PrintF("RegExpExecStub\n"); |
| 586 } |
| 587 #endif |
| 588 }; |
| 589 |
| 590 |
| 591 class CallFunctionStub: public CodeStub { |
| 592 public: |
| 593 CallFunctionStub(int argc, InLoopFlag in_loop, CallFunctionFlags flags) |
| 594 : argc_(argc), in_loop_(in_loop), flags_(flags) { } |
| 595 |
| 596 void Generate(MacroAssembler* masm); |
| 597 |
| 598 private: |
| 599 int argc_; |
| 600 InLoopFlag in_loop_; |
| 601 CallFunctionFlags flags_; |
| 602 |
| 603 #ifdef DEBUG |
| 604 void Print() { |
| 605 PrintF("CallFunctionStub (args %d, in_loop %d, flags %d)\n", |
| 606 argc_, |
| 607 static_cast<int>(in_loop_), |
| 608 static_cast<int>(flags_)); |
| 609 } |
| 610 #endif |
| 611 |
| 612 // Minor key encoding in 32 bits with Bitfield <Type, shift, size>. |
| 613 class InLoopBits: public BitField<InLoopFlag, 0, 1> {}; |
| 614 class FlagBits: public BitField<CallFunctionFlags, 1, 1> {}; |
| 615 class ArgcBits: public BitField<int, 2, 32 - 2> {}; |
| 616 |
| 617 Major MajorKey() { return CallFunction; } |
| 618 int MinorKey() { |
| 619 // Encode the parameters in a unique 32 bit value. |
| 620 return InLoopBits::encode(in_loop_) |
| 621 | FlagBits::encode(flags_) |
| 622 | ArgcBits::encode(argc_); |
| 623 } |
| 624 |
| 625 InLoopFlag InLoop() { return in_loop_; } |
| 626 bool ReceiverMightBeValue() { |
| 627 return (flags_ & RECEIVER_MIGHT_BE_VALUE) != 0; |
| 628 } |
| 629 |
| 630 public: |
| 631 static int ExtractArgcFromMinorKey(int minor_key) { |
| 632 return ArgcBits::decode(minor_key); |
| 633 } |
| 634 }; |
| 635 |
| 636 |
| 637 enum StringIndexFlags { |
| 638 // Accepts smis or heap numbers. |
| 639 STRING_INDEX_IS_NUMBER, |
| 640 |
| 641 // Accepts smis or heap numbers that are valid array indices |
| 642 // (ECMA-262 15.4). Invalid indices are reported as being out of |
| 643 // range. |
| 644 STRING_INDEX_IS_ARRAY_INDEX |
| 645 }; |
| 646 |
| 647 |
| 648 // Generates code implementing String.prototype.charCodeAt. |
| 649 // |
| 650 // Only supports the case when the receiver is a string and the index |
| 651 // is a number (smi or heap number) that is a valid index into the |
| 652 // string. Additional index constraints are specified by the |
| 653 // flags. Otherwise, bails out to the provided labels. |
| 654 // |
| 655 // Register usage: |object| may be changed to another string in a way |
| 656 // that doesn't affect charCodeAt/charAt semantics, |index| is |
| 657 // preserved, |scratch| and |result| are clobbered. |
| 658 class StringCharCodeAtGenerator { |
| 659 public: |
| 660 StringCharCodeAtGenerator(Register object, |
| 661 Register index, |
| 662 Register scratch, |
| 663 Register result, |
| 664 Label* receiver_not_string, |
| 665 Label* index_not_number, |
| 666 Label* index_out_of_range, |
| 667 StringIndexFlags index_flags) |
| 668 : object_(object), |
| 669 index_(index), |
| 670 scratch_(scratch), |
| 671 result_(result), |
| 672 receiver_not_string_(receiver_not_string), |
| 673 index_not_number_(index_not_number), |
| 674 index_out_of_range_(index_out_of_range), |
| 675 index_flags_(index_flags) { |
| 676 ASSERT(!scratch_.is(object_)); |
| 677 ASSERT(!scratch_.is(index_)); |
| 678 ASSERT(!scratch_.is(result_)); |
| 679 ASSERT(!result_.is(object_)); |
| 680 ASSERT(!result_.is(index_)); |
| 681 } |
| 682 |
| 683 // Generates the fast case code. On the fallthrough path |result| |
| 684 // register contains the result. |
| 685 void GenerateFast(MacroAssembler* masm); |
| 686 |
| 687 // Generates the slow case code. Must not be naturally |
| 688 // reachable. Expected to be put after a ret instruction (e.g., in |
| 689 // deferred code). Always jumps back to the fast case. |
| 690 void GenerateSlow(MacroAssembler* masm, |
| 691 const RuntimeCallHelper& call_helper); |
| 692 |
| 693 private: |
| 694 Register object_; |
| 695 Register index_; |
| 696 Register scratch_; |
| 697 Register result_; |
| 698 |
| 699 Label* receiver_not_string_; |
| 700 Label* index_not_number_; |
| 701 Label* index_out_of_range_; |
| 702 |
| 703 StringIndexFlags index_flags_; |
| 704 |
| 705 Label call_runtime_; |
| 706 Label index_not_smi_; |
| 707 Label got_smi_index_; |
| 708 Label exit_; |
| 709 |
| 710 DISALLOW_COPY_AND_ASSIGN(StringCharCodeAtGenerator); |
| 711 }; |
| 712 |
| 713 |
| 714 // Generates code for creating a one-char string from a char code. |
| 715 class StringCharFromCodeGenerator { |
| 716 public: |
| 717 StringCharFromCodeGenerator(Register code, |
| 718 Register result) |
| 719 : code_(code), |
| 720 result_(result) { |
| 721 ASSERT(!code_.is(result_)); |
| 722 } |
| 723 |
| 724 // Generates the fast case code. On the fallthrough path |result| |
| 725 // register contains the result. |
| 726 void GenerateFast(MacroAssembler* masm); |
| 727 |
| 728 // Generates the slow case code. Must not be naturally |
| 729 // reachable. Expected to be put after a ret instruction (e.g., in |
| 730 // deferred code). Always jumps back to the fast case. |
| 731 void GenerateSlow(MacroAssembler* masm, |
| 732 const RuntimeCallHelper& call_helper); |
| 733 |
| 734 private: |
| 735 Register code_; |
| 736 Register result_; |
| 737 |
| 738 Label slow_case_; |
| 739 Label exit_; |
| 740 |
| 741 DISALLOW_COPY_AND_ASSIGN(StringCharFromCodeGenerator); |
| 742 }; |
| 743 |
| 744 |
| 745 // Generates code implementing String.prototype.charAt. |
| 746 // |
| 747 // Only supports the case when the receiver is a string and the index |
| 748 // is a number (smi or heap number) that is a valid index into the |
| 749 // string. Additional index constraints are specified by the |
| 750 // flags. Otherwise, bails out to the provided labels. |
| 751 // |
| 752 // Register usage: |object| may be changed to another string in a way |
| 753 // that doesn't affect charCodeAt/charAt semantics, |index| is |
| 754 // preserved, |scratch1|, |scratch2|, and |result| are clobbered. |
| 755 class StringCharAtGenerator { |
| 756 public: |
| 757 StringCharAtGenerator(Register object, |
| 758 Register index, |
| 759 Register scratch1, |
| 760 Register scratch2, |
| 761 Register result, |
| 762 Label* receiver_not_string, |
| 763 Label* index_not_number, |
| 764 Label* index_out_of_range, |
| 765 StringIndexFlags index_flags) |
| 766 : char_code_at_generator_(object, |
| 767 index, |
| 768 scratch1, |
| 769 scratch2, |
| 770 receiver_not_string, |
| 771 index_not_number, |
| 772 index_out_of_range, |
| 773 index_flags), |
| 774 char_from_code_generator_(scratch2, result) {} |
| 775 |
| 776 // Generates the fast case code. On the fallthrough path |result| |
| 777 // register contains the result. |
| 778 void GenerateFast(MacroAssembler* masm); |
| 779 |
| 780 // Generates the slow case code. Must not be naturally |
| 781 // reachable. Expected to be put after a ret instruction (e.g., in |
| 782 // deferred code). Always jumps back to the fast case. |
| 783 void GenerateSlow(MacroAssembler* masm, |
| 784 const RuntimeCallHelper& call_helper); |
| 785 |
| 786 private: |
| 787 StringCharCodeAtGenerator char_code_at_generator_; |
| 788 StringCharFromCodeGenerator char_from_code_generator_; |
| 789 |
| 790 DISALLOW_COPY_AND_ASSIGN(StringCharAtGenerator); |
| 791 }; |
| 792 |
| 793 } } // namespace v8::internal |
| 794 |
177 #endif // V8_CODE_STUBS_H_ | 795 #endif // V8_CODE_STUBS_H_ |
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